Crossword Genius

Line in geometry (3)

Ross

I believe the answer is:

ray

'line in geometry' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for ray that I've seen before include "Beam or flatfish" , "Narrow beam of light" , "Gleam" , "A little light" , "Beam; man's name" .)

I've seen this clue in The New York Times.
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